Ceres is the Roman goddess of agriculture and the namesake of cereal. Her daughter, Prosperpine, was once abducted by Pluto. This threw Ceres into such a funk that she stopped all crops from growing. Only when Prosperpine was returned to her did Ceres allow the crops to grow once more. Prosperpine later became the wife of Pluto, but returned to Ceres for half of each year. So for half of each year Ceres cheerfully allows the crops to grow and for half of each year keeps the crops from growing because she’s so depressed.